High-Redshift Gravitationally Lensed Galaxies and Tunable Filter Imaging

TL;DR

This paper discusses a novel approach using tunable filter imaging and multifibre spectroscopy to efficiently identify high-redshift gravitationally lensed galaxies, improving upon traditional survey methods.

Contribution

It introduces an alternative strategy for selecting gravitational lens candidates based on optimal lines-of-sight, leveraging advanced imaging and spectroscopy techniques.

Findings

Successful compilation of a sample of high-redshift lensed galaxies

Demonstrated advantages of the new selection method over traditional surveys

Progress in identifying lenses at intermediate redshift z~0.4

Abstract

Most surveys for multiply-imaged gravitational lenses, outside of rich galaxy clusters, are based on sifting through large samples of distant sources to identify the rare examples of lensing. An alternative strategy, based on the selection of optimal lines-of-sight, offers a number of significant advantages. Utilising the multiplex capability of wide-area multifibre spectroscopy, together with tunable Fabry-Perot imaging, it is now possible to undertake such investigations. Progress in compiling a sample of high-redshift star-forming galaxies, gravitationally lensed by massive early-type galaxies at intermediate redshift, z~0.4, is described.